JBL PB10 Subwoofer Circuit Diagram Power Bass Series

JBL sub-Woofer PB10 - Schematic - tests

Output power – 150Watts
Driver – 10” woofer

Unit under Test

1. Connect one line level input cable (RCA) from signal generator to either Right or Left Level input on UUT. VOLUME control should be full counterclockwise.
2. Turn on generator, adjust to 100mV, 50 Hz.
3. Plug in UUT; LED’s on the front panel may be either Red or Green. Turn VOLUME control full clockwise. Low Pass control should be set fully clockwise (150°).
4. LED should turn Green; immediately bass response should be heard and felt from port tube opening.
5. Turn off generator, turn VOLUME control fully counterclockwise, and disconnect RCA cables.
6. Connect one pair of speaker cables to either high level input terminal on UUT. Cables should be connected to an integrated amplifier fed by the signal generator.
7. Turn on generator and adjust so that speaker level output is 1.0V, 50 Hz. Turn VOLUME control full clockwise.
8. Green LED should light; immediate bass response should be heard and felt from the port tube opening.

Sweep Function

1. Follow steps 1-4 above, using a sweep generator as a signal source.
2. Sweep generator from 20Hz to 300Hz. Listen to the cabinet and drivers for any rattles, clicks, buzzes or any other
noises. If any unusual noises are heard, remove driver and test

Driver Function

1. Remove driver from cabinet; detach + and - wire clips.
2. Check DC resistance of driver; it should be 5.8 ohms.
3. Connect a pair of speaker cables to driver terminals. Cables should be connected to an integrated amplifier fed by
a signal generator and adjust so that speaker level output is 5.0V.
4. Sweep generator from 20Hz to 1kHz. Listen to driver for any rubbing, buzzing, or other unusual noises.

Circuit Diagram [Schematic]

If you used the high-level (speaker) inputs and there is no sound from any of the speakers:

•Check that receiver/amplifier is on and source is playing.
•Check that powered sub-woofer is plugged into and active electrical outlet and is switched on.
•Check all wires and connections between receiver/amplifier and speakers. Make sure all wires are connected. Make sure none of the speaker wires are frayed, cut or
punctured.
•Review proper operation of your receiver/amplifier.

If there is low (or no) bass output:

•Make sure the connections to the left and right “Speaker Inputs” have the correct polarity (+and-).
•Make sure that the sub-woofer is plugged into an active electrical outlet and (PB12 only) switched on.
•Adjust the crossover point.
•Flip the Phase Control switch to the opposite position.
•If you are using a Dolby Digital/DTS receiver or processor, make sure that the sub-woofer adjustments on the receiver/processor are set up correctly.
•Slowly turn the Level Control clockwise until you begin to hear the desired amount of bass.

If you used the line-level inputs and there is no sound from the sub-woofer:

•Check that receiver/amplifier is on and a source is playing.
•Check that powered sub-woofer is plugged into an active electrical outlet and is switched on.
•Check all wires and connections between receiver/amplifier and subwoofer. Make sure all wires are connected. Make sure none of the wires are frayed, cut or punctured.
•Review proper operation of your receiver/amplifier.
•Slowly turn the Level Control clockwise until you begin to hear the desired amount of bass.
•Make sure that you have configured your receiver/processor so that the subwoofer/LFE output is on.